trace_events.getEnabledCategories()

• 返回：<string>

  ¥Returns: <string>

返回所有当前启用的跟踪事件类别的逗号分隔列表。当前启用的跟踪事件类别集由所有当前启用的 Tracing 对象和使用 --trace-event-categories 标志启用的任何类别的联合确定。

¥Returns a comma-separated list of all currently-enabled trace event categories. The current set of enabled trace event categories is determined by the union of all currently-enabled Tracing objects and any categories enabled using the --trace-event-categories flag.

给定下面的文件 test.js，命令 node --trace-event-categories node.perf test.js 会将 'node.async_hooks,node.perf' 打印到控制台。

¥Given the file test.js below, the command node --trace-event-categories node.perf test.js will print 'node.async_hooks,node.perf' to the console.

const trace_events = require('node:trace_events');
const t1 = trace_events.createTracing({ categories: ['node.async_hooks'] });
const t2 = trace_events.createTracing({ categories: ['node.perf'] });
const t3 = trace_events.createTracing({ categories: ['v8'] });

t1.enable();
t2.enable();

console.log(trace_events.getEnabledCategories()); 拷贝